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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47eb01286fe5ddfbd4ff4af1ecd9aaf6b069575442b6b022e98d2952723c0535' 
  AND token = '2pQdAlnt1gGuhdgOgRyEgxX/cSpU+F3y7StSk41akHY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}